seller’s sale migration

I found what is a mistake to me:
a) I have a seller “x” and “y”.
b) I created a product “z” in the seller “y”.
b) The product “z” was sold by the seller “y” and was left with stock 0 (zero).
c) Any product of any seller that is sold and the stock is 0 (zero), I change the seller for the Admin. In other words, the above product “z” now belongs to seller “x”.
d) What happened is that the sale is also migrated to the seller’s account “x” in the wrong way. It belongs to the seller “z”.